21465804 has 24 divisors (see below), whose sum is σ = 50163120. Its totient is φ = 7144384.

The previous prime is 21465803. The next prime is 21465817. The reversal of 21465804 is 40856412.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21465803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12502 + ... + 14114.

It is an arithmetic number, because the mean of its divisors is an integer number (2090130).

Almost surely, 2^21465804 is an apocalyptic number.

It is an amenable number.

21465804 is an abundant number, since it is smaller than the sum of its proper divisors (28697316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21465804 is a wasteful number, since it uses less digits than its factorization.

21465804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 21465804 is about 4633.1203308354. The cubic root of 21465804 is about 277.9173882855.

The spelling of 21465804 in words is "twenty-one million, four hundred sixty-five thousand, eight hundred four".